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- W2114125386 abstract "We report the first observation of a charm-strange meson DsJ+(2632) at a mass of 2632.5±1.7 MeV/c2 in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, Ds+η and D0K+. In the Ds+η decay mode we observe a peak with 101 events over a combinatoric background of 54.9 events at a mass of 2635.4±3.3 MeV/c2. There is a corresponding peak of 21 events over a background of 6.9 at 2631.5±2.0 MeV/c2 in the decay mode D0K+. The decay width of this state is <17 MeV/c2 at 90% confidence level. The relative branching ratio Γ(D0K+)/Γ(Ds+η) is 0.14±0.06. The mechanism that keeps this state narrow is unclear. Its decay pattern is also unusual, being dominated by the Ds+η decay mode.Received 17 June 2004DOI:https://doi.org/10.1103/PhysRevLett.93.242001©2004 American Physical Society" @default.
- W2114125386 created "2016-06-24" @default.
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